/**
 * Copyright 2012 Niall Gallagher
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.googlecode.cqengine.collection.impl;

import java.util.concurrent.locks.ReadWriteLock;

/**
 * @author Niall Gallagher
 */
public class ConcurrencyManagerImpl implements ConcurrencyManager {

    private final boolean writesEnabled;
    private final TrackedReentrantReadWriteLock readWriteLock = new TrackedReentrantReadWriteLock();

    public ConcurrencyManagerImpl(boolean writesEnabled) {
        this.writesEnabled = writesEnabled;
    }

    @Override
    public void acquireReadLock() {
        if (writesEnabled) {
            readWriteLock.readLock().lock();
        }
    }

    @Override
    public void acquireWriteLock() {
        if (writesEnabled) {
            readWriteLock.writeLock().lock();
        }
    }

    @Override
    public void releaseReadLock() {
        if (writesEnabled) {
            readWriteLock.readLock().unlock();
        }
    }

    @Override
    public void releaseWriteLock() {
        if (writesEnabled) {
            readWriteLock.writeLock().unlock();
        }
    }
}
